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authorDavid S. Miller <davem@davemloft.net>2005-10-13 14:41:23 -0700
committerDavid S. Miller <davem@davemloft.net>2005-10-13 14:41:23 -0700
commitc8923c6b852d3a97c1faad0566e38fca330375a7 (patch)
treeeb79e97c5468bba641c7a34b83514876f4902cf2 /net/ipv4
parentc931488cc4619eecfe68a2f046b5898fddc2f904 (diff)
[NETFILTER]: Fix OOPSes on machines with discontiguous cpu numbering.
Original patch by Harald Welte, with feedback from Herbert Xu and testing by Sébastien Bernard. EBTABLES, ARP tables, and IP/IP6 tables all assume that cpus are numbered linearly. That is not necessarily true. This patch fixes that up by calculating the largest possible cpu number, and allocating enough per-cpu structure space given that. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/netfilter/arp_tables.c14
-rw-r--r--net/ipv4/netfilter/ip_tables.c17
2 files changed, 20 insertions, 11 deletions
diff --git a/net/ipv4/netfilter/arp_tables.c b/net/ipv4/netfilter/arp_tables.c
index fa1634256680..a7969286e6e7 100644
--- a/net/ipv4/netfilter/arp_tables.c
+++ b/net/ipv4/netfilter/arp_tables.c
@@ -716,8 +716,10 @@ static int translate_table(const char *name,
}
/* And one copy for every other CPU */
- for (i = 1; i < num_possible_cpus(); i++) {
- memcpy(newinfo->entries + SMP_ALIGN(newinfo->size)*i,
+ for_each_cpu(i) {
+ if (i == 0)
+ continue;
+ memcpy(newinfo->entries + SMP_ALIGN(newinfo->size) * i,
newinfo->entries,
SMP_ALIGN(newinfo->size));
}
@@ -767,7 +769,7 @@ static void get_counters(const struct arpt_table_info *t,
unsigned int cpu;
unsigned int i;
- for (cpu = 0; cpu < num_possible_cpus(); cpu++) {
+ for_each_cpu(cpu) {
i = 0;
ARPT_ENTRY_ITERATE(t->entries + TABLE_OFFSET(t, cpu),
t->size,
@@ -885,7 +887,8 @@ static int do_replace(void __user *user, unsigned int len)
return -ENOMEM;
newinfo = vmalloc(sizeof(struct arpt_table_info)
- + SMP_ALIGN(tmp.size) * num_possible_cpus());
+ + SMP_ALIGN(tmp.size) *
+ (highest_possible_processor_id()+1));
if (!newinfo)
return -ENOMEM;
@@ -1158,7 +1161,8 @@ int arpt_register_table(struct arpt_table *table,
= { 0, 0, 0, { 0 }, { 0 }, { } };
newinfo = vmalloc(sizeof(struct arpt_table_info)
- + SMP_ALIGN(repl->size) * num_possible_cpus());
+ + SMP_ALIGN(repl->size) *
+ (highest_possible_processor_id()+1));
if (!newinfo) {
ret = -ENOMEM;
return ret;
diff --git a/net/ipv4/netfilter/ip_tables.c b/net/ipv4/netfilter/ip_tables.c
index eef99a1b5de6..75c27e92f6ab 100644
--- a/net/ipv4/netfilter/ip_tables.c
+++ b/net/ipv4/netfilter/ip_tables.c
@@ -27,6 +27,7 @@
#include <asm/semaphore.h>
#include <linux/proc_fs.h>
#include <linux/err.h>
+#include <linux/cpumask.h>
#include <linux/netfilter_ipv4/ip_tables.h>
@@ -921,8 +922,10 @@ translate_table(const char *name,
}
/* And one copy for every other CPU */
- for (i = 1; i < num_possible_cpus(); i++) {
- memcpy(newinfo->entries + SMP_ALIGN(newinfo->size)*i,
+ for_each_cpu(i) {
+ if (i == 0)
+ continue;
+ memcpy(newinfo->entries + SMP_ALIGN(newinfo->size) * i,
newinfo->entries,
SMP_ALIGN(newinfo->size));
}
@@ -943,7 +946,7 @@ replace_table(struct ipt_table *table,
struct ipt_entry *table_base;
unsigned int i;
- for (i = 0; i < num_possible_cpus(); i++) {
+ for_each_cpu(i) {
table_base =
(void *)newinfo->entries
+ TABLE_OFFSET(newinfo, i);
@@ -990,7 +993,7 @@ get_counters(const struct ipt_table_info *t,
unsigned int cpu;
unsigned int i;
- for (cpu = 0; cpu < num_possible_cpus(); cpu++) {
+ for_each_cpu(cpu) {
i = 0;
IPT_ENTRY_ITERATE(t->entries + TABLE_OFFSET(t, cpu),
t->size,
@@ -1128,7 +1131,8 @@ do_replace(void __user *user, unsigned int len)
return -ENOMEM;
newinfo = vmalloc(sizeof(struct ipt_table_info)
- + SMP_ALIGN(tmp.size) * num_possible_cpus());
+ + SMP_ALIGN(tmp.size) *
+ (highest_possible_processor_id()+1));
if (!newinfo)
return -ENOMEM;
@@ -1458,7 +1462,8 @@ int ipt_register_table(struct ipt_table *table, const struct ipt_replace *repl)
= { 0, 0, 0, { 0 }, { 0 }, { } };
newinfo = vmalloc(sizeof(struct ipt_table_info)
- + SMP_ALIGN(repl->size) * num_possible_cpus());
+ + SMP_ALIGN(repl->size) *
+ (highest_possible_processor_id()+1));
if (!newinfo)
return -ENOMEM;